Mechanism for balancing by yielding resistances weights as embroidery-work frames suspended by supporting-levers.



W. A. STELLMACHER.

MECHANISM FOR BALANCING BY YIELDING RESISTANGES WEIGHTS AS EMBROIDERY WORK FRAMES SUSPENDED BY SUPPORTING LEVERS. I

APPLICATION FILED MAY 21, 1912.

1,126,905. Patented Feb. 2,1915.

4 SHEETS-SHEET 1.

"r W M. w mar" 'ill' NORRIS PFIERS CO7. PHOTO LITHQ, WASHINLI'UN D. c.

W. A. STELLMAGHER. MECHANISM FOR BALANCING BY YIELDING RESISTANGES WEIGHTS AS EMBROIDERY WORK FRAMES SUSPENDED BY SUPPORTING LEVERS.

APPLICATION FILED MAY 21, 1912.

1,126,905, Patented Feb.2, 1915.

m u I!!! Witnesses:

m I (SW.

THE NORRIS PETERS CO.. PHOTOYLITHUH WAaHING TON. D. C.

W. A. STELLMAGHER. MECHANISM FOR BALANCING BY YIELDING RESISTANGES WEIGHTS AS EMBROIDERY WORK FRAMES SUSPENDED BY SUPPORTING LEVERS. APPLICATION FILED MAY 2i, 1912.

1,126,905, Patented Feb. 2, 1915.

E I 3 4 SHEBTSSHEET 3.

I I 13 M 4 H JHEI \1 55 IHI 2 I. i #L/ 6/ I'II;

W. A. STELLMAUHER.

MECHANISM FOR BALANCING BY YIELDING RESISTANOES WEIGHTS AS EMBROIDERY WORK FRAMES SUSPENDED BY SUPPORTING LEVI-IRS. I

APPLICATION FILED MAY 21, 1912.

1,126,905,, PatentedFeb.2,1915.

74 SHEETS-SHEET 4.

UNITED STATES PATENT OFFICE.

WILHELM ALBERT STELLMACHER, OF ARBON, SWITZERLAND.

MECHANISM FOR BALANCING BY YIELDING R-ESISTANCES WEIGHTS AS EMBROIDERY- WORK FRAMES SUSPENDED BY SUPPORTING-LEVERS.

Specification of Letters Patent.

Patented Feb. 2, 1915.

Application filed May 21, 1912. Serial No. 698,844.

To all whom it may concern:

Be it known that L'VVILHELM ALBERT STELLMACHER, a citizen of the Republic of Switzerland, residing at Arbon, Switzerland, have invented new and useful Improvements in Mechanisms for Balancing by Yielding Resistances Veights as Embroidery-lVoi-k Frames Suspended by Supporting-Levers; and I do hereby declare the following to be a full, clear, and exact de scription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to mechanisms for balancing weights by yielding resistances in which mechanism the action of the resistance is transmitted to the weight by means of curved members which are connected to each other by drawing members. By such mechanisms as hitherto constructed weights can be balanced only, which are suspended by levers which remain constant at all heights of the weight (concentric disks), but it is impossible to balance thereby as much as practically necessary weights which are suspended on levers the effective length of which alters at the different heights of the weight (supporting levers).

The object of my invention is to provide a mechanism of the type referred to, in which compensating members are inserted between the supporting levers and the resistance, the effective leverage of which members alter when the weight or embroidery work frame is vertically moved so that said weight or frame will be balanced in all its positions, 2'. 6. under all conditions of operation.

The accompanying drawings illustrate different forms of construction of a mechanism according to my invention in connection with embroidery machines, only those parts of the machines being shown which are necessary for purposes of explanation.

Figure 1 is a side elevation and Fig. 2 a front elevation showing a first form of construction. Fig. 3 is a front elevation showing a second form of construction. Figs. 1 to 6 are side elevations illustratin three other forms of construction. Fig.

illustrates the use of another kind of resistance than that used in the remaining forms of construction.

Referring first to Figs. 1 and 2, 1 designates an embroidery work frame which is supported by rollers 2 mounted on levers 3 of which only one is shown on the drawings. The supporting levers 3 are fixed on axles l which are mounted to turn in an arm 5 secured to the frame 6 of the embroidery machine. Disks 7 are secured to the axles 4:, which disks are connected to each other by an endless drawing member 8. To one of the axles 4- there iis also secured a curved disk 9 on the surface of which a drawing member 10 is guided, the latter being adjustably connected at one end to the disk. Arms 11 secured to the frame 6 form a bearing for an axle 12 which carries two curved disks 13 and 1-1. The drawing member 10 is guided on the surface of the disk 13 and secured to it. A drawing member 15 is guided on the surface of the curved disk is and at one-end is secured to it while at its other end this drawing member is guided on the surface of a curved disk 16 to which it is adjustably connected. The disk 16 is secured to an axle 17 which is supported by arms 18 secured to the frame 6. A worm wheel 19 loosely mounted on the axle 17 engages a worm 20 arranged within a casing 21 on one of the arms 18. A helical torsion spring 22 is secured at one end to the curved disk 16 and at its other end to the worm wheel 19.

The spring 22 balances the weight of the work frame 1 and is stretched more or less according to the different vertical positions of the work frame. The tension of the spring may be adjusted by means of the worm wheel 19, worm 20 and a key set on a square 20 forming an extension of the worm shaft projecting from the casing 21. The work frame 1 being suspended by supporting levers, the action of its weight on the spring 22 varies at the different heights of the frame. The curved disks therefore must balance the action of the weight of the frame at its difierent heights, as well as compensate the variations of the strength of the spring for said heights, while with the constructions in which concentric disks are applied it is necessary only to balance the weight itself.

The surfaces of the curved disks 9, 1.8, 14

and 16 are shaped so that when theheight of the work frame 1 is altered, always :the eifective leverage of one disk of each pair of disks 9,113, and 14, 16 is altered, that means substantially. increased while the-act ing levers of the other disks are accordingly substantially decreased in such manner that the torsional movement of thespring is re tarded so much with relation to the rotation of the supporting lQYlIS, l'/ll2tt the tension of thespring is altered onlva small amount, even if thealterationof-the lever- V ageof the supporting levers isjwholly ha]- 114, otherwise such forms. of the two reanced' g c p t The alteration of the leverage .of the suppcrtinglevers could not be balan'cedWitn out inserting the two. curved disks 13 and mainingcurvesS), 16 would become necessary that'practically could not be used. ln'the formof'construction shown in Fig.

3 there is arranged a second spring 23. byithe side'of the curved disks 13 and 14. ()ne end of this spring issecured to thecurved disk l4 7, while the. other, endis secured ,to'the worm wheel2t of -a worm adjusting mechanism, by means, of which the tension. of .the spring 23 may be, adjusted in the above described manner. In this. construction both 4 thecurved disk'9 is replaced by a lever 25.

The curved disk 16 is formedwith'regard to theal-teration of the action of lever 25: at the sitions of the frame.

difl'ere'nthei'ght-s' of the frame 1' sothat the v frame and the spring are balanced at all po The same result isobtainedwith the form of construction shown in, Fig. 5 in which the drawing member 10 is secured atone end to a projection 26 of one of the disks7. jAlso' in the form of construction according to Fig. tithe drawing member 10 is secured at one end to a projection 26 ofone of the disks 7. The curved disk 13, is replaced by alever 27 and the curved disk 16 is formed 1 according tothe alterations of the action of lever 27 and of the lever arm of the pointon the. projection 26,. j 4

,Thetorsion springs '22, may be arwhich the drawing member 10 is secured to ranged on bOth'SidGS-OfthQ curved disks if 1 desired. The springs 'n ay also be replaced by. other kinds of yielding resistances as for this .form of construction a'piston 29 is examplea pneumaticcushion ('Fig. 7). In

' mounted in U a icylinder 28 secured ,to the 'frame'ti; the piston r0d'30 being connected to va drawing member .31.

guided and fixedon the surface of a concenj The Y latter is tricdisk 32 secured to the axle 17. The

space invthe cylinder above the piston 29 is ,weight,.,and. mechanism. for. automatically I compensating the .variationlin strength, .of the s pring for difl fer'entj positions of the [weight counterbalanced. thereby ,1 whereby the power requir'ed tolimove the -weight .is

the samelunder all conditions offoperation.

supportedf weights, -wh1ch comprises ithe combination. with a weight supp'orting. leverQ; .of-Imeans for compensating .thcvaria- Mechanism for spring lever- Itions of the. effectivegleverage of.;.said cinem her, ai connecting member between saidile ver and means, a connterbalancingg spring, means i for automatically compensating for "thevariation in .-streng"th of .the spring for different positionsof the weight-and connectingmeans between the two compensat ing means. i l

,Mechanism for spring balancing leversupp'orted weights which comprises me combination withv a weight-supporting, lever; of. cam mechanism for. compensating" the variation of the effective leverage of said lever, a counterbalancing spring, cam mechanism; connected to said=fip ling for ioo compensating the variation in strengthlof tween thecammechanisms. v i v a i, ln mechanis ni for spring balancing lever-supported 'wei ghts, the combination with a weight-supporting lever; of mean -r0 compensating the variation of the efiecti ve' leverage of said lever, acounterbalancing spring, means for. adjusting the strengthof the spring, a cam forcompensating the variationfinthe length .of 'the spring for v ary-c tensile connection between the two sating mechanisms. v r j H j 5, In mechanismfor spring balancingqlee Ye pport d ei i with a 'we ight "suppoif'ting lever, of in eans 'for.-compensating for the" variation of the effective leverage QfStld lOVGI, an adjustable, flexible connecting member between said-arm and means, a torsion springineans, \to compensate for thevarying strength of the spring a flexible, "adjustable connecting "member between said'two means, and means to adjust'the tensionof said spring; f

compenlever-supported weights, the combination" the spring, and a,,connecting member be-" irigJpositiOIlSDf the \iigh't, and a flexible the combination fizo izs

.6. .In mechanismflfor spring m with a weight-supporting lever; of a pair of cams for compensating for the variation of the effective leverage of said lever, a flexible connection between one of the cams and said lever arm, a torsion spring, a cam connected thereto for compensating variations in spring tension, a flexible connection between the second one of said pair of cams and the cam connected to said spring, a Worm Wheel connected to the spring, and a Worm for rotating the Wheel, whereby the tension of said spring may be altered.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of tWo subscribing Witnesses.

WILHELM ALBERT STELLMACHER.

Witnesses FRIDOLIN OSTWALDER. EUGENE NABEL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

